On a similar note I’ve just gone and launched an open source project based on an internal tool we’ve had for the past few years. Sure, we used to use prototype and not jQuery, and used to modify a .js file rather than use a WebControl… but feature wise we’re a step further down the road.

http://www.codeplex.com/ShUIE

Enables any JavaScript and CSS to be injected into any SharePoint page, according to context.

It’s fun to play with, and for a laugh I re-implemented jqDock in less than a couple of hours to show how easy it is.